1. L. D. Quin and J.Tyrell, Fundamentals of Heterocyclic Chemistry: Importance in Nature and in the Synthesis of Pharmaceuticals, John Wiley & Sons Inc., New York, 2010
2. Comprehensive Heterocyclic Chemistry III, ed. A. R. Katritzky, C. A. Ramsden, E. F. V. Scriven and R. J. K. Taylor, Pergamon, Oxford, 2008
3. Comprehensive Heterocyclic Chemistry II, ed. A. R. Katritzky, E. F. V. Scriven and C. W. Rees, Pergamon, Oxford, 1996
4. Comprehensive Heterocyclic Chemistry, ed. A. R. Katritzky and C. W. Rees, Pergamon, Oxford, 1984
5. T. Eicher and S.Hauptmann, The Chemistry of Heterocycles, Wiley-VCH, Weinheim, 2003